Commit 1ae15b6c authored by Chaitanya Kumar Borah's avatar Chaitanya Kumar Borah Committed by Tvrtko Ursulin
Browse files

drm/i915/dp: Fix VSC dynamic range signaling for RGB formats 



For RGB, set dynamic_range to CTA or VESA based on
crtc_state->limited_color_range so sinks apply correct
quantization. YCbCr remains limited (CTA) range.
(DP v1.4, Table 5-1)

v2:
- Added Reported-by and Tested-by tags

v3:
- Add back YCbCr comment(Suraj)

Cc: stable@vger.kernel.org #v5.8+
Reported-by: default avatarDeepChirp <DeepChirp@outlook.com>
Closes: https://gitlab.freedesktop.org/drm/i915/kernel/-/work_items/15874


Tested-by: default avatarDeepChirp <DeepChirp@outlook.com>
Fixes: 9799c4c3 ("drm/i915/dp: Add compute routine for DP VSC SDP")
Assisted-by: GitHub-Copilot:GPT-5.4
Signed-off-by: default avatarChaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>
Reviewed-by: default avatarSuraj Kandpal <suraj.kandpal@intel.com>
Signed-off-by: default avatarSuraj Kandpal <suraj.kandpal@intel.com>
Link: https://patch.msgid.link/20260505090920.2479112-1-chaitanya.kumar.borah@intel.com


(cherry picked from commit 38e10ddae6f8d42a2e8437fcd25a1cac51106c64)
Signed-off-by: default avatarTvrtko Ursulin <tursulin@ursulin.net>
parent 4cfe4c0e

drivers/gpu/drm/i915/display/intel_dp.c

+7 −2
Original line number Diff line number Diff line
@@ -3119,8 +3119,13 @@ static void intel_dp_compute_vsc_colorimetry(const struct intel_crtc_state *crtc 
	drm_WARN_ON(display->drm,

		    vsc->bpc == 6 && vsc->pixelformat != DP_PIXELFORMAT_RGB);



	/* all YCbCr are always limited range */

	/* All YCbCr formats are always limited range. */

	if (vsc->pixelformat == DP_PIXELFORMAT_RGB)

		vsc->dynamic_range = crtc_state->limited_color_range ?

			DP_DYNAMIC_RANGE_CTA : DP_DYNAMIC_RANGE_VESA;

	else

		vsc->dynamic_range = DP_DYNAMIC_RANGE_CTA;



	vsc->content_type = DP_CONTENT_TYPE_NOT_DEFINED;

}